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The University of California is conducting an anonymous survey to find out why cannabis farmers are not joining the legal market.

The survey’s objective is to identify barriers to joining the legal market, specifically obtaining the needed state and local permits.

Proposition 64, approved by the state’s voters in 2016, went into effect at the start of 2018 to legalize recreational marijuana and impose taxes on cannabis cultivation and the sale of cannabis products.

When cannabis growers do not join the regulated market, the state doesn’t receive the cultivation tax revenue. California’s initial cannabis tax revenue has been significantly lower than the projected $1 billion annually, according to the university.

Research has shown that illegal cannabis production can also be bad for the environment, including poisoning wildlife.

The survey at https://ucanr.edu/sites/compliance can be filled out online until Aug. 1.